Manufacture of black coloring-matters.



No Drawing.

JOSEPH TURNER AND HARRY DEAN, 0F HUDDERSFIELD, ENGLAND,

MANUFACTURE OF BLACK COLORINGMATTERS.

To all whom it may concern;

Be it known that ,we, J osnrrr TURN R and HARRY DEAN, subjects of King George V of Great Britain, residing in- Huddersfield, in the county of York, England, have invented certain new and useful Improvements in the Manufacture of .Black Coloring-Matters, of which the following is a specification.

1n the specification of our prior Patent No. 987417 is described a preparation of direct cotton dyestufl's by using ortho and para chlor anilins' as a starting oint.- We have now found that further va uable dyestufls are produced by using, as ,an end component, chlor meta phenylene diamin.

In the production of direct dyeing cotton dyestufis according to our invention, we

' combine with one molecule of the neutral salt of amido naphthol disulfonic acid (1.8.3.6) (H acid) one molecule of ortho or para chlor diazo benzol, or a mixture of the two, taking care that throughout the re-action a slight excess of mineral acid remains present. VVhen the ,combiration is completed, the color is made alkaline and a tetrazo solution composed of one molecule of benzidin is added and subsequently one molecule of chlor meta phenylene diamin '1 :214. The coloring matter so produced exhibits great atlinity for vegetable fibers.

As an example of the production of the coloring matter, we give the following 128 parts by weight of para chlor anilin are diazot-ized 1n the usual manner, and a neutrail solution prepared from- 341 parts of the acid sodium salt' of amido naphthol disulfonic acid (1.8.3.6) (H acid) is poured in. When the combination is complete, the

mixture is rendered alkaline, and a tetrazo Specification of Letters Iatent.

' I Application filed April 24, 1911. Serial No. 622,909.

Patented Jan. 16,1912.

solution from 184 parts of benzidin is run in, and, subsequently, 143 parts of chlor meta phenylene diamin added. The dyestufi, which is isolated in the usual manner, dyes vegetable fibers deep greenish black shades. I

\Ve may replace benzidin by "other para diamins, such as tolidin or dianisidin.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is z- ;1. A process for manufacturing a dyestufl which consists in combining one molecule of a diazo chlor benzol with one molecule of ainido naphtholdisulfonic, acid (1.8.3.6) (H acid) in slightly mineral acid solution, thencombining the intermediate body thus obtained with one molecule of a tetrazotized para diamin in alkaline solution, and finally adding one' molecule of chlor meta phenylenfe diamin 1 :2 :4.

"2. A process for manufacturing 'a dyestuff which consists incombining one molecule of a diazo chlor benzol with one molecule of amid'o naphthol disulfonicacid (1.8.3.6) (H acid) in slightly mineral acid solution,

then combining the intermediate body thus obtained with one molecule of tetrazotized benzidin in alkaline solution, and finally adding one molecule of chlormeta phenylen'e diamin 1 :2 :4.

a In testimony whereof we aflix our signatures in the presence of two witnesses.

JOSEPH TURNER. HARRY DEAN. Witnesses: FREonRIcK I. BRIGHT,

THOMAS H. BARRON. 

